US3304823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for punching sheet material
Assignee: Individual
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Filing: 1965-03-29
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Granted: 1967-02-21
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Expires: 1985-03-29
Abstract
No abstract record available.
Inventors
- 👤 Nowak Edmund Franciszek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:01
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/002; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/06; Y10T83/869; Y10T83/8752; Y10T83/8821; Y10T83/8828; Y10T83/8831; Y10T83/8834; Y10T83/8858; Y10T83/8864
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
176 words
A METHOD OF PUNCHING SHEET METAL COMPRISING THE STEPS OF: (1) PLACING THE SHEET METAL ON A DIE SPACED FROM A MEMBER HAVING A PLURALITY OF SETS OF PUNCHING TOOLS, (2) MOVING THE MEMBER RELATIVE TO THE DIE SO THAT THE PUNCHING TOOLS MOVE TOWARDS THE METAL SHEET ON THE DIE UNTIL THE PUNCHING EDGES OF A FIRST SET OF TOOLS ON THE MEMBER ENGAGE THE METAL SHEET, (3) MOVING THE MEMBER TOWARDS THE METAL SHEET SO THAT THE PUNCHING TOOLS OF THE FIRST SET PENETRATE THE METAL SHEET TO A DEPH OF APPROXIMATELY 3/10 THE THICKNESS OF THE METAL SHEET AT WHICH TIME THE CUTTING EDGES OF THE SECOND SET OF TOOLS ENGAGE THE SURFACE OF THE METAL SHEET, AND (4) MOVING THE MEMBER TOWARDS THE METAL SHEET SO THAT BOTH THE FIRST AND SECOND SETS OF TOOLS COMPLETELY PENETRATE THE METAL SHEET, THE CUTTING EDGES OF THE FIRST SET BEING SPACED FROM THE CUTTING EDGES OF THE SECOND SET AT ALL TIMES BY A DISTANCE OF APPROXIMATELY 3/10 THE THICKNESS OF THE METAL SHEET.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |